Fatigue of 2024-T351 aluminium alloy at different load ratios up to 1010 cycles |
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| Affiliation: | 1. Federal University of Rio Grande do Norte, Natal, Brazil;2. CONSTRUCT, Faculty of Engineering, University of Porto, Portugal;3. Federal Rural University of the Semi-Arid, Mossoró, Brazil;4. INEGI, Faculty of Engineering, University of Porto, Porto, Portugal;1. Institute of Physics and Materials Science, University of Natural Resources and Life Sciences, Vienna, Austria;2. Medtronic plc, Core Technologies, Corporate Science and Technology, Minneapolis, USA;1. Institute of Physics and Materials Science, BOKU, Peter Jordan Str. 82, A 1190 Vienna, Austria;1. College of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan;2. Machinery Systems Division, Industrial Products Company, Hitachi Ltd., Nakanoshima Festival Tower, 3-18 Nakanoshima 2-chome, Kita-ku, Osaka 530-0005, Japan;3. Faculty of Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan;4. National Institute of Technology, Toyota College, 2-1 Eisei-cho, Toyota, Aichi 471-8525, Japan;5. Graduate School of Engineering, Kobe University, Rokkoudai, Nada-ku, Kobe, Hyogo 657-8501, Japan;6. National Institute of Technology, Akashi College, Uozumi, Akashi, Hyogo 674-8501, Japan |
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| Abstract: | Fatigue properties of 2024-T351 aluminium alloy are investigated in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regime. Endurance tests are performed with ultrasonic equipment at 20 kHz cycling frequency at load ratios of R = ?1, R = 0.1 and R = 0.5 up to 1010 cycles. Additional servo-hydraulic tests between 8 and 10 Hz at R = 0.1 show no frequency influence on fatigue lifetimes. Linear lines in double logarithmic S–N plots are used to approximate data. Slope exponents of approximation lines increase with increasing numbers of cycles for all load ratios. Failures above 5 × 109 cycles (R = ?1 and R = 0.1) or 1010 cycles (R = 0.5) occur, and no fatigue limit is found. Fatigue cracks leading to failures above 109 cycles are initiated at the surface or slightly below at broken constituent particles or at agglomerations of fractured particles, which are probably Al7Cu2(Fe, Mn). Specimens stressed with more than 1010 cycles at R = ?1 without failure show several cracks starting at constituent particles. Maximum crack lengths are 30 μm, which is considerably below grain size. |
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